WHUS71 KBOX 210516

MWWBOX



URGENT - MARINE WEATHER MESSAGE

National Weather Service Boston/Norton MA

116 AM EDT Sat Mar 21 2026



ANZ230-236-210630-

/O.CAN.KBOX.SC.Y.0033.000000T0000Z-260321T0600Z/

Boston Harbor-Narragansett Bay-

116 AM EDT Sat Mar 21 2026



...SMALL CRAFT ADVISORY IS CANCELLED...



Winds and seas have subsided below small craft advisory

thresholds.



$$



ANZ232>235-237-210900-

/O.CON.KBOX.SC.Y.0033.000000T0000Z-260321T0900Z/

Nantucket Sound-Vineyard Sound-Buzzards Bay-Rhode Island Sound-

Block Island Sound-

116 AM EDT Sat Mar 21 2026



...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 5 AM EDT EARLY

THIS MORNING...



* WHAT...Southwest winds 15 to 20 kt with gusts up to 25 kt and 

  seas 4 to 6 feet.



* WHERE...In Massachusetts coastal waters, Nantucket Sound, 

  Vineyard Sound and Buzzards Bay. In Rhode Island coastal 

  waters, Rhode Island Sound and Block Island Sound.



* WHEN...Until 5 AM EDT early this morning.



* IMPACTS...Conditions will be hazardous to small craft.



PRECAUTIONARY/PREPAREDNESS ACTIONS...



Inexperienced mariners, especially those operating smaller

vessels, should avoid navigating in hazardous conditions.



&&



$$



ANZ250-254>256-212200-

/O.CON.KBOX.SC.Y.0033.000000T0000Z-260322T0000Z/

Coastal waters east of Ipswich Bay and the Stellwagen Bank

National Marine Sanctuary-

Coastal waters from Provincetown MA to Chatham MA to Nantucket MA

out 20 nm-

Coastal Waters extending out to 25 nm South of Marthas Vineyard

and Nantucket-

Coastal Waters from Montauk NY to Marthas Vineyard extending out

to 20 nm South of Block Island-

116 AM EDT Sat Mar 21 2026



...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS

EVENING...



* WHAT...West winds 10 to 20 kt with gusts up to 30 kt and seas 

  4 to 7 feet.



* WHERE...In Massachusetts coastal waters, Coastal waters east 

  of Ipswich Bay and the Stellwagen Bank National Marine 

  Sanctuary, Coastal waters from Provincetown MA to Chatham MA 

  to Nantucket MA out 20 nm and Coastal Waters extending out to 

  25 nm South of Marthas Vineyard and Nantucket. In Rhode Island 

  coastal waters, Coastal Waters from Montauk NY to Marthas 

  Vineyard extending out to 20 nm South of Block Island.



* WHEN...Until 8 PM EDT this evening.



* IMPACTS...Conditions will be hazardous to small craft.



PRECAUTIONARY/PREPAREDNESS ACTIONS...



Inexperienced mariners, especially those operating smaller

vessels, should avoid navigating in hazardous conditions.



&&



$$



ANZ231-251-210900-

/O.CON.KBOX.SC.Y.0033.000000T0000Z-260321T0900Z/

Cape Cod Bay-Massachusetts Bay and Ipswich Bay-

116 AM EDT Sat Mar 21 2026



...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 5 AM EDT EARLY

THIS MORNING...



* WHAT...Southwest winds 10 to 20 kt with gusts up to 25 kt and 

  seas 2 to 4 feet.



* WHERE...Cape Cod Bay and Massachusetts Bay and Ipswich Bay.



* WHEN...Until 5 AM EDT early this morning.



* IMPACTS...Conditions will be hazardous to small craft.



PRECAUTIONARY/PREPAREDNESS ACTIONS...



Inexperienced mariners, especially those operating smaller

vessels, should avoid navigating in hazardous conditions.



&&



$$